TWI505132B - Certification method and electronic device - Google Patents

Description

Digital file authentication establishment and verification method and electronic device thereof

The invention relates to a method for establishing and verifying digital file authentication, in particular to a method for establishing and verifying digital file authentication based on additional time stamp.

In recent years, Internet technology has developed rapidly, and information can be sent to the world through the Internet without any restrictions. Therefore, a transmitting device can easily transmit via E-mail, File Transfer Protocol (FTP), SMS, peer-to-peer (P2P) or other transmission methods. The digital file is transmitted to the receiving device at the other end.

Although the Internet is convenient for people, it allows information to reach every corner of the world, and makes it easy for everyone to send information to any corner, but in the process of transmitting information, it has a high chance of being victimized by others. Intercepting, and the person intercepting the message may attempt to modify, rewrite or alter the data of the digital file in the information, so that the recipient may be misled by the modified file file. Digital files may contain sensitive content (such as audio recordings, contracts, transaction details, etc.) for important events, trade secrets or some personal information. If the digital file is tampered with without giving notice to the recipient, the recipient will be exposed to unintended information risks among.

Therefore, there is a need for an authentication method and an authentication method corresponding to the authentication so that the person receiving the message can confirm whether the message sent by the sender is the most original and complete file.

The present invention mainly discloses a digital file authentication establishing method, the authentication establishing method comprising the steps of: providing a reliable time generating unit to a first electronic device; reading the reliable time generating unit to generate a reliable time stamp, and The reliable time stamp is appended to the data of the first digit file; generating a first code by using the first digit file; generating a first digit signature of the first digit file by encrypting the first code; The first digital file and the first digital signature are transmitted to a second electronic device.

The present invention further discloses an electronic device including a reliable time generating unit for generating and providing a reliable time stamp; a processing module for generating a digital file having the reliable time stamp, wherein the processing module Obtaining the reliable time stamp by reading the reliable time generating unit, and attaching the reliable time stamp to the data of the digital file; and an authentication establishing module electrically connecting the reliable time generating unit and the processing module, A code for generating a code using the digital file, and generating a digital signature associated with the digital file by encrypting the code.

The invention further discloses an electronic device, comprising: a processing module, configured to receive a digital file of one of the other electronic devices and a digital signature corresponding to the digital file; and a verification module electrically connecting the processing module Group, the verification module comprises: a code generating unit, Generating a first code by using the digital file; a decrypting unit for decrypting the digital signature to obtain a second code; and a comparing unit for comparing the first code with the second code, To verify the originality and integrity of the digital file.

300‧‧‧First electronic device

310‧‧‧Reliable time generating unit

320‧‧‧Certificate building module

324‧‧‧ Code Generation Module

326‧‧‧Encryption Module

340‧‧‧Processing module

342‧‧‧Communication Module

400‧‧‧Internet

500‧‧‧Second electronic device

520‧‧‧ verification module

522‧‧‧ Code Generation Module

524‧‧‧Decryption module

526‧‧‧ Alignment module

540‧‧‧Processing module

542‧‧‧Communication Module

Step S100~Step S108

Step S200 to step S206

ABS_A‧‧‧ first code

ABS_B‧‧‧ second code

ABS_C‧‧‧ third code

FILE_o‧‧‧The original digital file generated by the first electronic device

FILE_r‧‧‧Digital files received by the second electronic device

F_Data‧‧‧data in the original digital file

F_Data’‧‧‧data from the digital file received by the second electronic device

HEAD‧‧‧Original header information

Header information in the digital file received by the HEAD’‧‧‧ second electronic device

RT‧‧‧ original reliable time stamp

Reliable time stamp in the digital file received by the RT’‧‧‧ second electronic device

SIG‧‧‧ digital signature

The detailed description of the preferred embodiments of the present invention and the accompanying drawings, which are to be understood by those of ordinary skill in the art of

1A and FIG. 1B are flowcharts of a digital file authentication establishment and verification method according to an embodiment of the present invention.

2 is a schematic diagram showing the operation flow of a digital file according to an embodiment of the present invention.

3 is a functional block diagram of a method for establishing and verifying a digital file authentication of two electronic devices according to an embodiment of the present invention.

Please refer to FIG. 1A, FIG. 1B and FIG. 2. 1A and FIG. 1B are flowcharts of a digital file authentication establishment and verification method according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing the operation flow of a digital file according to an embodiment of the present invention.

In the present embodiment, the steps shown in FIG. 1A and FIG. 1B are used to establish and verify the authentication from the first electronic device (ie, the sender) to the digital file of the second device (ie, the recipient). Methods. The steps performed by the first electronic device corresponding to a sender are as shown in FIG. 1A. The steps performed by the second electronic device corresponding to a recipient are shown in FIG. 1B.

As shown in FIG. 1A and FIG. 2, a reliable time generating unit is provided to the first electronic device as in step S100. The reliable time generating unit is used to provide a reliable time stamp. The reliable time generating unit can be an internal component in the first electronic device or a separate external component. If the reliable time generating unit is an internal component in the first electronic device, the network/satellite can be periodically time-aligned and corrected by a reference time server; if the reliable time generating unit is an external independent component, The generated reliable time stamp can be transmitted to the first electronic device through wired or wireless communication. Further details of the reliable time generation unit are provided in the following paragraphs.

When the data F_Data in the digital file is generated in the first electronic device, a reliable time RT (Real Time) is read from the reliable time generating unit as a stamp, and the reliable time stamp RT is added to the digital file FILE_o as steps S102. In other words, the reliable time stamp RT is generated by reading the reliable time generating unit, and the reliable time stamp RT is attached to the digital file FILE_o. In some embodiments, the reliable timestamp RT can be appended to the header of the digital file FILE_o. The digital file FILE_o can be an audio log file, a video file, a file file or any similar file (such as any digital file with a header column for recording a reliable time stamp RT). In this embodiment, the digital file FILE_o is exemplified by an audio file. After step S102, the digital file may contain data F_Data, original header information HEAD (such as ID3 tags), and a reliable time stamp RT appended to the digital file FILE_o header column.

When the data F_Data of the digital file is generated, the reliable time stamp RT records the precise time (such as including the year, month, day, hour, minute, second, and even a more subtle time scale). Because of the irreversibility of time, it is impossible to have two at a time, so that It can be used as proof that the digital file is original (not changed). In other words, the reliable time stamp on the first electronic device cannot be modified in any way (if it cannot be manually reversed by the user). /setting/changing, etc.).

In an embodiment, when the reliable time stamp RT is read, as in step 102, and when the first electronic device has the ability to establish a network connection with the Internet, it further includes accessing the Internet through the Internet. The reference time server (in this example, the reference time server can be a network time server) and the step of synchronizing the reliable time generating unit with the time of the reference time server.

In other embodiments, when the reliable time stamp RT is read as in step 102 and when the first electronic device has a global positioning function, it further includes accessing a reference time server based on the global positioning function (in this example, The reference time server can be a timer on an artificial satellite and the time synchronization unit is synchronized with the reference time server.

In other embodiments, the first electronic device further includes a battery for providing power to the reliable time generating unit. When the electronic device is manufactured, the time of the reliable time stamp RT generated by the reliable time generating unit is synchronized with an accurate official time, and the reliable time stamp RT cannot be modified (eg, by removing the first electronic device toughness) Body time setting function).

Thereafter, the first code ABS_A is generated using the digital file FILE_o including the reliable time stamp RT as in step S104. In this embodiment, step S104 may generate the first code ABS_A by a hash algorithm. For example, Message-Digest Algorithm 5 (MD5), Secure Hash Algorithm-256 (SHA-256), Secure Hash Algorithm-384 (Secure Hash Algorithm) -384, SHA-384), Secure Hash Algorithm-512 (SHA-512) Among the Cyclic Redundancy Check-32 (CRC32), it is selected as a hash algorithm. The hash algorithm is used to generate a unique set of symbolic codes for large data. If the data entered into the hash algorithm is the same, the output (code) will be the same. On the other hand, if the two data input into the hash algorithm are slightly different, the code converted by the hash algorithm will be completely different.

Thereafter, the digital signature SIG of the digital file FILE_o is generated by encrypting the first code ABS_A as in step S106. For example, the first code ABS_A may be encrypted according to a private key owned by a user of the first electronic device and based on an RSA encryption algorithm (an asymmetric encryption algorithm) to generate a digital signature SIG .

Then, the digital file FILE_o is transmitted to the second electronic device (e.g., the recipient) together with the digital signature SIG as in step S108. In contrast, the second electronic device has the ability to verify the authenticity and integrity of the digital file FILE_r by the digital signature SIG' and the reliable time stamp RT' contained in the digital file FILE_r.

As shown in FIG. 1B and FIG. 2, after the first electronic device sends the FILE_o and the digital signature SIG, the information received by the second electronic device is the digital file FILE_r and the digital signature SIG' as in step S200.

Thereafter, the second code ABS_B is generated from the digital file FILE_r as in step S202.

It should be noted that the first code ABS_A (see step S104 for generating mode) and the second code ABS_B (see step S202 for generating mode) are generated by the same algorithm. In this embodiment, the first code ABS_A and the second code ABS_B are generated by the same hash algorithm. In this example, if the digital file FILE_r received by the second electronic device is still the digital file FILE_o originally generated by the first electronic device (without any modification), the first code ABS_A and the second code ABS_B will be two identical codes. If the digital file FILE_r received by the second electronic device is not the original digital file FILE_o, the first code ABS_A and the second code ABS_B will be different codes, which is due to the reliable time stamp RT in the digital file FILE_r. 'and/or data F_Data' (even and/or original header information HEAD') is not the same as the reliable timestamp RT and/or data F_Data (and/or the original header information HEAD) in the digital file FILE_o.

Then, a third code ABS_C is generated and obtained by decrypting the digital signature SIG' as in step S204. In this embodiment, the digital signature SIG' may be decrypted based on the Public Key owned by the user of the first electronic device and based on the RSA encryption algorithm to generate the third code ABS_C.

The public key corresponding to the private key can be opened to anyone, such as making it available to anyone through the Internet. Therefore, the second device can obtain the public key corresponding to the first device private key, so that the second device can decrypt the digital signature SIG'. However, the second device is unable to obtain the private key of the first device. Therefore, the second device cannot reproduce the digital signature SIG originally created by the first electronic device. In this example, the third code ABS_C obtained by decrypting the digital signature SIG' is the same as the first code ABS_A.

Thereafter, the second code ABS_B and the third code ABS_C are compared to verify the digital file received by the second electronic device as in step S206. If the second code ABS_B is the same as the third code ABS_C, the digital file FILE_r is still the original digital file FILE_o generated by the first device (without any modification). If the second code ABS_B is different from the third code ABS_C, the second electronic device can issue a notification and reflect the situation (such as transmitting a report to the first electronic device, destroying the digital file FILE_r or other actions).

In this embodiment, the digital files FILE_o and FILE_r have reliable time stamps in addition to the same data. Even if someone else copies the same data as the data F_Data and puts the copied data F_Data into another digital file FILE_d (not shown), the receiver (second electronic device) can still recognize the digits. The file FILE_d is not the digital file FILE_o originally generated by the first electronic device, because the digital file FILE_d is not the same as the reliable time stamp RT recorded in the original digital file FILE_o.

Please refer to FIG. 3, which is a functional block diagram of a digital file authentication establishment and verification method performed by two electronic devices (a first electronic device 300 and a second electronic device 500) according to an embodiment of the present invention. The digital file transmitted by the first electronic device 300 to the second electronic device 500 can be used for authentication establishment and subsequent verification based on the previous embodiments.

As shown in FIG. 3, the first electronic device 300 (such as the sender described in the embodiment) includes a reliable time generating unit 310, an authentication establishing module 320, and a processing module 340. The reliable time generating unit 310 is used to provide a reliable time stamp. The processing module 340 is configured to generate data of the digital file. In this embodiment, when a digital file is generated, the processing unit reads the reliable time generating unit to obtain a reliable time stamp and attaches a reliable time stamp to the data of the digital file.

The first electronic device 300 can include a communication unit 342 for establishing an internet connection with the Internet. The authentication establishment module 320 is an electrical connection reliability time generation unit 310 and a processing module 340. The authentication establishment module 320 can include a code generation unit 324 and an encryption unit 326.

The code generation unit 324 is configured to generate a code using a digital file containing an additional reliable time stamp (produced by a hash algorithm such as MD5, SHA-1, SHA-256, SHA-384, SHA-512 or CRC32). . The encryption unit 326 is configured to generate a digital signature of the digital file by encrypting the code (according to the private key owned by the user of the first electronic device 300). Through the internet The network, digital signature can be transmitted to the second electronic device 500 along with the digital file.

The operation and description details of the reliable time generating unit 310 and the reliable time stamp on the first electronic device 300 are described in detail in the previous embodiments of FIG. 1A and FIG. 2, and details are not described herein again.

As shown in FIG. 3, the second electronic device 500 (the receiver as described in the embodiment) includes a verification module 520 and a processing module 540. The second electronic device 500 further includes a communication module 542 for establishing an internet connection with the Internet 400. The processing module 540 is configured to receive the digital file from the first electronic device 300 and the corresponding digital signature. The verification module 520 is an electrical connection processing module 540. The verification module 520 includes a code generation unit 522, a decryption unit 524, and a comparison unit 526. The code generation unit 522 is configured to generate the second code according to the digital file (produced by a hash algorithm such as MD5, SHA-1, SHA-256, SHA-384, SHA-512 or CRC32). The decryption unit 524 is configured to obtain a third code by decrypting the digital signature (according to the public key corresponding to the private key owned by the user of the first electronic device 300). The comparison unit 526 is for comparing the second code with the third code to verify the originality and integrity of the digital file.

The operation details of the second electronic device 500 have been described in the previous embodiment related to FIG. 1B and FIG. 2, and details are not described herein again.

Based on the previously described embodiments, the present invention discloses an authentication method for establishing an authentication/verification transfer to a digital file between two different devices by means of a reliable time stamp. Reliable time stamps cannot be changed by any user. Because of the irreversibility of time, a specific point in time cannot occur twice, so it can be used as proof of the original digital file.

The detailed description above is a detailed description of one of the possible embodiments of the present invention, which is not intended to limit the scope of the invention, which is not Equivalent implementations or modifications are intended to be included within the scope of the invention.

ABS_A‧‧‧ first code

ABS_B‧‧‧ second code

ABS_C‧‧‧ third code

FILE_o‧‧‧Digital files generated by the first electronic device

FILE_r‧‧‧Digital files received by the second electronic device

Data in the F_Data‧‧‧ digital file

HEAD‧‧‧Original header information

RT‧‧‧Reliable time stamp

SIG‧‧‧ digital signature

Claims (17)

A digital file authentication establishing method, comprising the steps of: providing a reliable time generating unit to a first electronic device; reading the reliable time generating unit to generate a reliable time stamp, and attaching the reliable time stamp to the first a data of a digital file; generating a first code by using the first digital file including the reliable time stamp, wherein the reliable time stamp records the precise time of the first digital file generation and cannot be modified; The first code generates a first digit signature of the first digit file; and transmits the first digit file and the first digit signature to a second electronic device. The method of claim 1, further comprising the steps of: receiving a second digit file and a second digit signature by a second electronic device; generating a second code by using the second digit file; The second digital signature obtains a third code; and compares the second code with the third code to verify whether the second digital file received by the second electronic device is generated by the first electronic device The first digit file is the same. The method of claim 1, wherein the first electronic device and the second electronic device respectively generate the first code and the second code by using the same algorithm. The method of claim 1, wherein the first electronic device and the second electronic device respectively generate the first code and the second code by using a hash algorithm. The method of claim 4, wherein the message digest algorithm 5 (MD5), the secure hash algorithm-256 (Secure Hash Algorithm-256, SHA-256), and the secure hash calculus are used. Method-384 (Secure Hash Algorithm -384, SHA-384), Secure Hash Algorithm - 512 (SHA-512) and Cyclic Redundancy Check -32 (CRC32) For this hash algorithm. The method of claim 1, wherein the first code is encrypted according to a private key owned by a user of the first electronic device. The method of claim 6, wherein the third code is decrypted using a public key corresponding to a private key. The method of claim 1, wherein the first electronic device has the capability of communicating with a reference time server, and further comprising the step of: the reliable time generating unit performing the first electronic device and the reference time server Time synchronization. The method of claim 8, wherein the reference time server is an artificial satellite or a network time server. The method of claim 1, wherein the first electronic device includes a battery to provide power to the reliable time generating unit, and the reliable time stamp generated by the reliable time generating unit when the first electronic device is manufactured The time is synchronized with an official time. An electronic device comprising: a reliable time generating unit for generating and providing a reliable time stamp, wherein the reliable time stamp records a precise time generated by a digital file and cannot be modified; and a processing module is configured to generate The digital file having the reliable time stamp, wherein the processing module obtains the reliable time stamp by reading the reliable time generating unit, and attaching the reliable time stamp to the data of the digital file; and an authentication establishing module The reliable time generating unit and the processing module are electrically connected to generate a code by using the digital file, and generate a digital signature related to the digital file by encrypting the code. The electronic device of claim 11, wherein the authentication establishment module generates the code by a hash algorithm. The electronic device of claim 12, wherein the message digest algorithm 5 (MD5), the secure hash algorithm-256 (Secure Hash Algorithm-256, SHA-256), and the security hash are used. Algorithm-384 (Secure Hash Algorithm -384, SHA-384), Secure Hash Algorithm - 512 (SHA-512) and Cyclic Redundancy Check -32 (CRC32) As the hash algorithm. The electronic device of claim 11, wherein the code is encrypted according to a private key owned by a user of the electronic device. The electronic device of claim 11, wherein the electronic device further comprises a communication unit for establishing a network connection with the Internet, and the reliable time generating unit is connected to the official network through the network. Time for time synchronization. The electronic device of claim 11, wherein the electronic device further comprises a global positioning unit for communicating with an artificial satellite, the reliable time generating unit performing time synchronization by reading an official time of the artificial satellite. The electronic device of claim 11, wherein the electronic device further comprises a battery to provide power to the reliable time generating unit, and the reliable time stamp generating time generated by the reliable time generating unit when the electronic device is manufactured It is synchronized with an official time.